remote-bzr: fix cloning of non-listable repos

Commit 95b0c60 (remote-bzr: add support for bzr repos) introduced a
regression by assuming all bzr remote repos are listable, but they are
not.

If they are not listable they are basically useless, so let's assume
there is no bzr repo.

Reported-by: Thorsten Kranzkowski <dl8bcu@dl8bcu.de>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git-submodule.txt: Clarify 'init' and 'add' subcommands.

Describe how 'add' sets the submodule's logical name, which is used in
the configuration entry names.

Clarify that 'init' only sets up the configuration entries for
submodules that have already been added elsewhere.  Describe that
<path> arguments limit the submodules that are configured.

Signed-off-by: Dale Worley <worley@ariadne.com>
Acked-by: Jens Lehmann <Jens.Lehmann@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Revert "remote-hg: update bookmarks when pulling"

This reverts commit 24317ef32ac3111ed00792f9b2921dc19dd28fe2.

Different versions of Mercurial have different arguments for
bookmarks.updatefromremote(), while it should be possible to call the
right function with the right arguments depending on the version, it's
safer to restore the old behavior for now.

Reported by Rodney Lorrimar.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'master' into next

* master:
  Revert "remote-hg: update bookmarks when pulling"
  git-submodule.txt: Clarify 'init' and 'add' subcommands.
  remote-bzr: fix cloning of non-listable repos